Adam lunger



(No Model.)

I A. LUNGEN. CIRCUIT CLOSER FOR ELECTRIC ALARMS. No. 309,790. PatentedDec. 23, 1884.

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ADAM LUNGEN, OF NE\V YORK, N. Y., ASSIGNOR TO EDlVAltDS & 00., OF SAMEPLACE.

CIRCUIT-CLOSER FOR ELECTRIC ALARMS.

SPECIFICATION forming part of Letters Patent No. 309,790, dated December23, 188%.

Application filed June 'i', 1883. (No model.)

To all whom it may concern:

Be it known that I, ADAM LUNGEN, of New York city, New York, haveinvented certain new and useful Improvements in Circuit-Glosers forElectric Alarms, of which the following is a specification.

My invention applies more especially to circuit-closing springs orcontacts adapted for application to windows with which a burglar- IOalarm circuit is connected; and it relates to that class ofwindow-springs which are formed with a slotted base-plate which ismortised into the sash-guide of the window-casing, and having acam-shaped bar pivoted in the slot p of the plate and projectingtherefrom in the path of the sash, and with a contact-spring fixed onthe back of the plate behind said earn, so that when the sash is raisedto a certain height the cam is depressed and makes contact with thecontactspring, thereby closing the circuit and sounding the alarm; andthe invention consists in the peculiar combinations and the constructionand arrangement of parts hereinafter more fully described and claimed.

In the drawings annexed, Figure 1 presents a front perspective view ofmy improved window eontactspring, and Fig. 2 gives a rear perspectiveview of the same. Fig. 3 is a veriical longitudinal section of the same,and Fig.

at a cross-section thereof. Fig. 5 is a moditt cation.

In these figures, a indicates the base-plate of the device, which ispreferably of a narrow oblong rectangular form,adapted to be set into amortise cut into the face of the sash guides or ways on the window-framein the usual manner, as will be understood. This plate is bored with acountersunk screw-hole at top and bottom, whereby it may be screwed inplace, and it has a long narrow slot in the middle from which the cam 12projects. This base-plate a has been usually formed of castbrass, whichnecessitates it being made coniparatively thick for sake ofstrcngth, butI 5 prefer to construct it from a strip of wrought or sheet brass bystamping it therefrom by dies, which are so formed as to cut out thecentral opening for the cam b, and also punch the holes for thefastening-screws in each end at one action, these holes beingsubsequently countersunk by boring on the front side of the plate. Thisenables the plate to be made much thinner and yet be stiffer andstronger than if cast, so-that the device when finished is much flatterand requires but a veryshallow mortise to receive it in thewindow-frame, which is a great advantage in applying the device to thewindow. The cam 22 is of the usual proximately-triangular form, and ispivoted at its lower and narrow end at the bottom of the slot in thebase-plate on a pivot-pin, c, which is driven through the sideof thebase-plate, as fully shown in Figs. 1, 2, and 3. The base or straightside of the cam when in repose is about flush with the back face of thebaseplate, while the inclined face of the cam projects from the front ofthe plate, so as to present an inclined wedging-face toward the sash,

so that when the sash is raised it will contact with said inclined face,and thereby depress 7c the cam back into the slot of the base-plate. asshown by dotted lines in Fig. 3, and thence move smoothly over the cam,as will be understood. New, on the back of the base-plate behind andover the cam is mounted the con- 7 tact-spring d, which is fixed at itslower end to the lower end of the plate below the hinged end of the cam,while the free end of the spring rests normally 011 an insulating-stop,e, which projects from the baseplate just above the tip of the cam, asseen best in Fig. 3. The lower or fixed end of the contact-spring isfirmly attached to yet insulated from the base-plate by theinsulating-eyelet f, which is embedded in the lower countersunk hole inthe plate, (see '85 Fig. 3,) this insulating-eyelet being held in firmposition by the metallic eyelet g,which is in metallic contact with thecontact-spring, but not with the base-plate, as illustrated. It willtherefore be noted that the lower screw which will fasten the device 011the window-casing will therefore be in contact with the eyelet g, andhence with the contact-sprin g (I, while the upper screw will be indirect contact with the base-plate, and therefore with 5 the cam; hence'the respective circuit-wires are connected with said screws, and thecireuit will be normally broken between the tip of the cam and the tipof the contact-spring; but if the cam is forced back in the slot it willI contact with the spring and close the circuit, as indicated by dottedlines in Fig.

I provide the cam with a distinct spring, 7:, independent of thecontactspring,which tends constantly to keep the cam protruded, thespring (1 serving solely as the contact-spriug. This cam-spring k ispreferably a plate-spring riveted at its fixed end to the back of thecam ueartlie tip of the same, with the free end of the spring bearing onthe back of the base-plate below or near the pivotal end of the cam, itsposition being thus reverse to the contactspring (Z.

By reference to Fig. 4 the cam-spring will be seen to be broader thanthe cam, so that its edges rest upon the base-plate, and thus form astop to limit the projection of the cam, as will be readily understoodfrom the figures.

The tip of the cam, or rather the fixed tip of the cam-spring It, isprovided with apoint, z, of platinum, and the coincident tip of thecontact-spring is also faced with platinum, as usual in these devices.It will therefore be seen that when the cam b is pressed back in thebase-plate the canrspring 7t will be flexed, as indicated by dottedlines in Fig. 3, and the platinum point 'i of the cam will make a longscraping contact with the contact-spring d, thus making perfectelectrical connection, and when the cam is released its spring 7; willin stantly force it back to its position of repose and break contactwith the contact-spring, as shown by full lines in Fig. 3. It will alsobe noted that the eam-spring k will hold the cam firmly in its positionof repose and prevent all idle play between the cam and contactspring,thus relieving the contactspring from any extra duty and preventing thepossibility of premature contacts between them through severe rattlingsof the windows, vibrations of the building, or other cause, which havebeen a source of frequent objections with the former construction. Theuse of the camspring it also obviates any necessity of bending oradjusting the contact-spring d relatively to the cam, as the formerconstruction rcquires, and this renders the entire device much moredurable and efficient. The cam-spring 7; is held to the cam b by thesingle rivet or screw or, and a small metal dowel-pin, a, is driventhrough the spring into the cam above the rivet n, which prevents thespring from turning out of place on the rivet. The cam b is also formedof wrought metal, being cut in transverse slices or sections from awrought brass bar rolled to have the same form in crosssection as thecam, which renders the construction very cheap, strong, and durable. l t

is therefore obvious that the window-contact when constructed, as aboveset forth, possesses several advantages, as already indicated, andpresents a positive improvement over the former constructions.

Instead of forming the cam 11 in the solid triangular form shown inFigs. 1, 2, and 3, it is much preferable to recess. the back of the camso as to form it in a curved shape, as shown in Fig. 5, as this willrender the cam much lighter and require less metal, and thus furthereconomize the manufacture. In this modification the cam-spring 7; willbe fastened to the cam by means of a square projection, 1),.projectingsolidly from the top end of the eam,whieh fits into a square hole in thespring,

and is thence riveted down over the spring,

as indicated, thus securing the spring firmly to the cam in a mannerwhich will not allow it to turn out of place, and without employing arivet separate from the cam. This form of cam will be also made ofwrought metal, being cut in transverse slices from a brass bar rolled tothe correct shape.

I am aware of the Patent No. 279,483, and make no claim to theconstruction shown therein as forming part of my invention.

Vhat I claim is 1. The plate a, provided with an oblong aperture, incombination with the cum 1), projecting through said aperture, andpivoted therein at one end, and the spring is, attached to the free endof said cam and projecting below its pivoted point to find a resistingpoint on said plate a beyond its aperture, to force the cam outward,said spring beingextended, substantially as described, to limit theforward movement of the cam, as set forth.

, 2. The apertured plate (6,1121Vl11g countersunk openings to afford ameans for securing the same in place, and cam b, in combination with thespring (I, insulating-ringf, and metal 103 eyelet g, the parts beingconstructed, arranged, and operating substantially as and for thepurposes set forth. i

3. A circuitcloser consisting of the following elements: apertured platea, provided with 105 openings on either side of said aperture to se curethe device in place, cam 2), spring it, stop 0, spring d,insulating-ringf, and eyelet r all constructed, combined, arranged, andoperating substantially as and for the purposes set I I0 forth.

ADAM LUNGEN.

Vitnesses:

JNO. E. GAVIN, Crms. M. IIIGGINS.

